the sum of the ages of rex, ben and alfred is 36 years, two years ago, ben was 3 times as old as rex was then, 8 years from now, alfred will be twice as old as ben will be then. find their present age.

Answer 1

let's see what they told you:

r+b+a = 36
b-2 = 3(r-2)
a+8 = 2(b+8)

Now just solve for the ages.